Water-tube boiler.



I. P. SNEDDGN. WATER TUBE BOILER.

APPLICATION FILED MAB. a, 1907.

R as M m D N E E & V Wm Wm H WIT'QESBES J. P SNEDDON. WATER TUBE BOILER. AEPLIGATION PfLED mm; 6, 1907.

Patented 5%."11909.

' a SHEEN-SHEET 2.

IMVENTOQ WITNESQES I I I 1 1 I I 1 1 I 1 I 1 I I I I J. P. SNEDDON. WATBE TUBE BOILER,

APPLIOATIOII FILED EAR. 6, 1907. I

mam-m m. a was.

J. I, SNEDDON.

WATER TUBE BOILERu urmonzoz: FILED MAR. a, 1907.

wig) Pamnted Dec. 7, 1909.

J. P. SNEDDON.

WATER TUBE BOILER.

APPLICATION FILED MAB. a, 1907.

942,797, Patented Dec. 7, 1909- 6 SHBETS'SHBET 5.

WITNESSES INVEQTOR Wound/7 I nrrnn straw -M ot? JAMES P. SNEDDO'N, (1F BARBERTON, OHIO, ASSIGNOR TO THE BABCGGK &; "WILCOX COMPANY, OF NEW YORK, N.' Y., A OORIORATION 035 NEW JERSEY.

WATEfi-TUEE BOILER.

states.

views of the super-heater connection; and

Figs. (5 and 7 are views similar to Fig. 1 showing modified forms of the invention.

. My invention relates to water tube boilers, and is designed to provide a new and improved boiler for installations of large power.

The object is to economize in floor space,

cost of buildings, steam piping,-etc.

further object is to provide an improvedconstruction and arrangement of superheater in connection with the boiler,

In the drawings, referring to the form of Figs. 1, 2 and 3, I show a five-drum boiler having twotouter upper drums 2', 2 and an intermediate and preferably larger drum 3.

t, 4 are the lower mud drums; all of these drums being preferably parallel and extending transversely of the setting. The drums 2 and st are connected by banks of tubes 5, while the drum 3 is connected with the mud drums & by the banks of tubes 6.

Each of the drums Q is connected with the middle drum 3 by Water circulators 7, and also by the upper steam circulators 8. The furnace chamber 9' preferably extends beneath the entire boiler, and is preferably provided with a central bridge wall 10. In the form shown, the boiler is fired at both ends through firing doors 11, 11, the grates 12 being shown as inclined downwardlytoward the central bridge wall. Each mud drum is preferably protected by an arch or root 13 of fire brick or refractory material, and the gases rising between the banks of tubes 6 divide at the upper part of the chamber, and flow in opposite directions through up and down passes and over suitable lmfiling'. in the form shown, each divided half of the gases is given three passes by means of battles l4 lying on the banks of tubes 6, and the bullies l5 spaced apart Specification of Letters Eatent. Application fileemareh e, 1907. Serial no. $566,849.

before passin downward passes of the gases between the" baffles 14; and 15 are provided with superheaters which thus receive heat from \thc gases after they pass over the tubes 6 and g upwardly among the tubes 5 to the outlet fines.

Any suitable type of superheater may be used, and in my claims upon the boiler proper, I do not wish to be restricted to the use of any superheater at all. in Tillie form shown, the superheater consists of two transverse junction boxes or continuous Patented 2 isoo headers 21 and 22 which are connected by the upwardly-extending tl-shapedtubes 23. The object in invertin. this U-type of superheater is to provide" raina'ge for the j unc tion boxes or headers.

As shown in Fi e. 3 and 4):, the ends of the headers are embedded in: oneside wall and extend through the other sidewall. These headers are also preferably slightly inclined endwise so that they will. dram. toward one emit.v A. drainage pipe; andcock are provided shown at, 24:. The lower box. or header of each superheater' is, connected to the steam space of its corresponding drum 2 by a pipe 25 leading upwardly from the drum-and thence downwardly within the setting .toone end portion; of the lower header. The other header is extended beyond: the side wall, and both headers'areprovided with hand hole openings at these ends. lo order to allow thishand hole openp ing on the outlet header, f 'form the pro jecting end portion of the header with aside projecting "nozzle flange 26 having 2. -ca 26 shrunk thereon, and to which the flangeofthe outlet pipe 27 is bolted.

In the operation of this superheater boiler, the fuel is fed in both front and back upon the pairs of grates. The fiame and gases rising into the central part of. the A-shaped combustion chamber divide at the topof this chamber, and flow in opposite directions downwardly. among the tubes of the superheaters. I They then fiowup among; the banks of tubes 5 to the outlet tlues. The cirtil culation is up through the tubes 6, and thence down through tilfi'illlbeS 5, being a I double Stirling circulation. The steam entering drum 3, is led over to the drums 2, and the steam from the drums 2 passes through the valve pipes to the superheater, where it is superheated and taken ott' through the box outlets. J

In Fig. 6 I show a form similar to that of Figs. 1 to 5, inclusive, except that the superheaters are inverted and their boxes placed in the roof of the setting, In this case also the battles 15 are arranged close to the outer sets of water tubes so as to leave a triangular space between the .two battles for the superheater. I also prefer to emplo in this case a pair of hinged bafiles 28, which are pivoted at the upper ends of the bailles 1d and are connected by chains 29 leading up through holes in the top of the setting to drums 30 on shafts actuated by depending chains 31 extending down within the reach of the ,operator. In this form parts similar to those of Fig. 1 are indicated by similar numerals with the letter (1' applied.

In Fig. 7 I show a form similar to that of Fig. 1, except that instead of U-shaped superhcaters the drum type is employed,.the

boxes being replaced by drums 21" and 22.-

In this case the upper drum is provided with a transverse partition midway of its length, and, the inlet tubes 8 lead into one side of the partition from the drums 2" and 3". This gives an up and down pass in the bank of the superheating tubes, t e steam outlet being in the chamber on the other side of the partition. Iii this drawing, parts similar to those of Fig. 1 are indicated-by similar numerals with the letter I) applied. In this form I show a flooding system, comprising a pipe s stem 32 leading from thewaterspace of th steam and water drum 3 into the lower drums of the superheaters. v

The boiler shown is of an improved type, especially adapted for large units, since it economizes floor space, and gives a very large grate area for the space occupied. a The mud drums are protected from the furnace heat by the-arches, and the boiler is economical and el'licient. The superheater is of an improved type, and gives especially good results in the location and arrangement shown.

The number of upper drums may be varied as well as the number of mud drums; the boiler may be used with or without superheaters; the batlling may be changed; the connections and circulation may be varied; the tubes may be straight or curved at their ends; and many other changes may be made without departing from the spirit and scope of my invention.

I claim:

1. A Water tube boiler of the .A-shaped type havinga C(Elliliftli-fliSPOSCti primary combustion chamber, firing openings at both front and rear of the boiler setting, drums, and circulating tubes connecting the drums, substantially as described.

2. Agnrater tube boiler of the class de scribed having a central primary combustion chamber and provided withfiring openings at both front and rear of the boiler setting, a plurality of escape dues, and bafiles for dividing the products of combustion bustion chamber, firing openings arranged at both front and rear of the boiler setting,

a pair of escape flues, drums, circulating tubes connecting the drums, and .bafiles arran ed between the banks of tubes, said ba es serving to direct separate portions of the products of combustion from the central combustion chamber in independent streams toward the eseape flues, substantially as described.

5. A water tube; boiler of the kshaped type having firingopenings' at both front and rear, a central primary combustion chamber with which both firing openings communicate, a pair of lower mud drums, a plurality of upper steam and water drums, banks of tubes connecting the drums, and baffles arranged between the banks of tubes, substantially described.

6. Ina water tube boiler of the l t-shaped type, frontand rear firing openings, a centrally-disposed combustion chamber with which both firing openings communicate, es-' cape fines for the products of combustion, drums, a plurality of banks of tubes connecting said drums, bafiles disposed between the banks of tubes and forming superheater chambers, and superheaters arranged in such chambers and dis osed in the direct course of the products .0 combustion, substantially as described.

7. A water tube boiler having front and rear firing openings and a central primary combustion chamber, a pair' of escape fines for the products of combustion, a pair of mud drums, a central and a pair of outer steam. and water drums, banks of tubes connecting the outer steam and water dlfilms to the mud drums, inclined banks of tubes connecting the central steam and water drum to both mud drums, apair ct batfies arranged in the space between each inclined bank of tubes and each outermost bank of tubes, and" a superheater disposed-between each pair of battles, substantiall as described.

8 In a water tu e boiler of the class described, firing o eningbs arranged at both separate escape fines, drums, and front and rear sets of circulating tubes connecting the drums, the innermost banks of tubes extending on inclined lines within the upper portion of the central combustion chamber, battles for directing the divided currents of products of combustion from the central combustion chamber toward the escape fines, and superheaters arranged between said battles, substantially as described.

10. An zit-shaped water tube boiler including a centrally-disposed primary. combuschamber, front an drums; a steam and water drum arranged at the upper portion of the combustion chain her and in a vertical plane approximately tion chamber, front and rear firing o enings bot-l1 communicatin, with the com ustion rear transverse mud midway the interval between the mud drums, and inclined banks of tubes connectin 'the mud drums to said steam and water rum, substantially as described.

11. A water tube boiler including a centrally-disposed primary combustion chain her, front and rear firing openings, front and rear transverse mud drums, a steam and water drum located above and in a vertical plane approximatelymidw'ay the interval between the two mud drums, front and rear steam and water drums, inclined banks ct tubes connecting the middle steam and water drums with the mud drums, and outer banks of tubes connecting the mud drumswiththe respective front and rear steam and water drums, substantially as described.

In testimony whereof, I have hereunto set my hand.

JAMES P. SNEDDON.

lVitnesses:

A. H. KIRKEAND, J. C. FRANK. 

